If the broken drill bit is into fiberglass. Try using a small wood plug bit and drill it as if you were making a plug. Drill only deep enough to reach the drill bit. Dig out the material which is now like a screw plug. Be Careful side-loading the drill bit on smaller bits or you could snap it off removing the plug material. .25 drill is pretty strong. I wouldn't to much about side load with a .25 drill, but in general. Then you can get a hold of the drill bit with short needle nose pliers. Don't use vise-grip pliers on it. They will tend to crush the bit and snap it. Don't hammer on it you will break it off deeper. A shot of tap magic on the drill bit will make the bit break free easy-er. Remove it counter clockwise and good luck. Never use a carbide drill bit when there is the chance of an interrupted cut. Any type of carbide bit will not stand up to the shock of an interrupted cut. Use the smallest plug bit you can. Then you can easily plug the hole. It works for me.

BILL